There was a session in Elevate 2022 called Integrate Twilio into Your PowerBuilder Applications to Send WhatsApp Messages .  I didn't catch the session but it may be useful for you to checkout the video.  I believe they are all uploaded now here:
https://www.appeon.com/conference/elevate-2022/agenda.html?ct=t%28Watch+Elevate+2022+Replay+Online%29&goal=0_47b6f83fed-e084450fc4-%5BLIST_EMAIL_ID%5D#gbvksl40mb

Can you try Topwiz's RunandWait program to call the curl and check whether it works for you.

Happiness Always
BKR Sivaprakash

Actually , I want to use official WhatsApp api, It works fine with postman and also with chilkat activex in powerbuilder.

I want to try with powerbulider 2022 httpclient object.

Here is my sample code

string ls_mobile_no = '9198251*****'
long ll_len
string ls_data_header, ls_Boundary, ls_data, ls_encoded, ls_Url , ls_ReturnJson, ls_End
Constant String CRLF = Char(13) + Char(10)

ls_Boundary = "--------------060605070804060204050809"
ls_End = "~r~n~r~n" + ls_boundary + "--"

ls_data_header = CRLF + CRLF + ls_Boundary + CRLF
ls_data_header += 'Content-Disposition: form-data; name="file"; filename="@D:/bill.pdf"' + CRLF
ls_data_header += 'Content-Type: application/pdf' + CRLF

ls_data = ls_data_header

Blob lblob_filedata
long ll_Num
ll_Num = FileOpen("d:\bill.pdf", StreamMode!)
FileReadEx(ll_Num, lblob_filedata)
FileClose(ll_Num)

// encode the binary data
CoderObject lnv_CoderObject
lnv_CoderObject = Create CoderObject
//ls_encoded = lnv_CoderObject.Base64Encode(lblob_filedata)
//ls_data += CRLF + ls_encoded + CRLF

Blob lblb_data
lblb_data = Blob (ls_data_header,EncodingUTF8!) + lblob_filedata + Blob (ls_End,EncodingUTF8!)
//ls_data = ls_data_header + CRLF + ls_encoded + CRLF + ls_End
ll_len = len(lblb_data)

// ===============
string ls_token , ls_postdata
Long ll_rtn
HttpClient lo_http
lo_http = Create HttpClient

string ls_phone_id
ls_phone_id = '*********'

ls_token = i_token

lo_http.SetRequestHeader("Authorization", "Bearer " + ls_token)

String ls_Base64Str

string ls_json
ls_Url = "https://graph.facebook.com/v15.0/" + ls_phone_id + "/media?messaging_product=whatsapp&file=d:\bill.pdf"
lo_http.SetRequestHeader ( "Accept", "*/*" )
lo_http.SetRequestHeader ( "Content-Type", "multipart/form-data; boundary=" + ls_Boundary )
lo_http.SetRequestHeader ( "Connection", "keep-alive" )
lo_http.SetRequestHeader ( "Content-Length", string(ll_len) )

ll_rtn = lo_http.sendrequest( "POST", ls_Url , lblb_data)

lo_http.GetResponseBody(ls_ReturnJson)

pl. guide me